It simply inserts an overlay graphic with an opacity setting so it darkens the screen by covering it. There's one on the App Store I found that looks like it works well, but it's badly implemented. I haven't found any good apps that resolve this. To work, I'm thinking that it would require hardware/firmware in the DISPLAY to support commands from the Mac. It's tedius, multi-step, awkward and worse if you have more than one external monitor. At least I don't recall ever seeing an application or utility on the Mac that could do this. That's unfortunate since there's an industry standard DDC protocol to make it possible to control brightness 'over-the-wire'.Īdjusting Dell monitor brightness from the physical panel button/menu is a hassle. The Dell 4K monitors work fine.īut Apple dumped its monitor business without creating a way to adjust 3rd party monitor brightness from the keyboard. Recently announced an ungodly expensive 'reference monitor'īeyond the need and budget of most people.įor my iMac, I bought two Apple-recommended 4K Dell monitors to go with my retina iMac. Apple stopped Thunderbolt display and Cinema display line.
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